A numerical study of electrode arrangements for precise microdrop generation in an electrowetting-based digital microfluidic platform

Yin Guan*, Baiyun Li, Mengnan Zhu, Shengjie Cheng, Jiyue Tu, Lu Xing

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Owing to the wide applications in a large variety of multidisciplinary areas, electrowetting-based digital microfluidics (DMF) has received considerable attention in the last decade. However, because of the complexity involved in the droplet generation process, the techniques and configurations for precise and controllable microdrop generation are still unclear. In this paper, a numerical study has been performed to investigate the impact of electrode arrangements on microdrop generation in an electrowetting-based DMF Platform proposed by a previously published experimental work. The governing equations for the microfluidic flow are solved by a finite volume formulation with a two-step projection method on a fixed numerical domain. The free surface of the microdrop is tracked by a coupled level-set and volume-of-fluid (CLSVOF) method, and the surface tension at the free surface is computed by the continuum surface force (CSF) scheme. A simplified viscous force scheme based on the 'Hele-Shaw cell' model is adopted to evaluate the viscous force exerted by the parallel plates. The generation process has been simulated with three different electrode arrangements, namely, 'SL', 'SW', and 'SQ'. The effect of electrode arrangement on microdrop volume has been investigated. Besides, the influences of the initial microdrop location and volume on the generation process for the 'SL' design have been studied. The results can be used to advance microdrop generation techniques for various electrowetting-based DMF applications.

Original languageEnglish
Title of host publicationASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer, MNHMT 2019
PublisherAmerican Society of Mechanical Engineers(ASME)
Number of pages8
ISBN (Electronic)9780791858905
DOIs
Publication statusPublished - 8 Jul 2019
Externally publishedYes
EventASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer, MNHMT 2019 - Dalian, China
Duration: 8 Jul 201910 Jul 2019

Publication series

NameASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer, MNHMT 2019

Conference

ConferenceASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer, MNHMT 2019
CountryChina
CityDalian
Period8/07/1910/07/19

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